(19)
(11) EP 0 533 333 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
28.07.1993 Bulletin 1993/30

(43) Date of publication A2:
24.03.1993 Bulletin 1993/12

(21) Application number: 92307104.7

(22) Date of filing: 04.08.1992
(51) International Patent Classification (IPC)5: G01N 21/85, G01N 21/17, G01J 3/10
(84) Designated Contracting States:
BE DE FR GB IT NL

(30) Priority: 19.09.1991 US 762287

(71) Applicant: TEXACO DEVELOPMENT CORPORATION
White Plains, New York 10650 (US)

(72) Inventors:
  • Brost, Dale Francis
    Sugarland, TX 77479 (US)
  • Rexach, Frank Manuel
    Houston, TX 77077 (US)
  • Winslow, Gregory Arthur
    Houston, TX 77042 (US)

(74) Representative: Wood, Anthony Charles 
Urquhart-Dykes & Lord 91 Wimpole Street
London W1M 8AH
London W1M 8AH (GB)


(56) References cited: : 
   
       


    (54) Optical photometry system


    (57) A system for on-line analysis of industrial fluid streams is capable of absorption, fluorescence and reflectance measurements at single wavelengths in the ultra-violet, visible and near infra-red spectral ranges. An optical fiber cable couples light pulses from an excitation light source (20) to a probe (12) in the fluid, couples light sensed by the probe to a photodetector (32), and couples light pulses from a reference light source (34) to the photodetector (32). The signals from the photodetector are combined to provide a response signal representative of a characteristic of the fluid in a manner independent of light source intensity, photodetector sensitivity, and temperature over a wide range.






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